Low and equatorial latitudes topside in NeQuick |
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| Institution: | 1. Aeronomy and Radiopropagation Laboratory, The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy;2. Institute for Geophysics, Astrophysics and Meteorology, University of Graz, Halbärthgasse 1, A-8010 Graz, Austria;1. Institute of Atmospheric Physics of ASCR, Prague, Czech Republic;2. Rutherford Appleton Laboratory, Chilton, United Kingdom;1. CITEUC, University of Coimbra, Almas de Freire, Sta. Clara, Coimbra 3040-004, Portugal;2. Geophysical and Astronomical Observatory, University of Coimbra, Almas de Freire, Sta. Clara, Coimbra 3040-004, Portugal;3. University of Alcalá, Pza. San Diego, s/n, 28801 Alcalá de Henares, Madrid, Spain;1. China University of Petroleum, Qingdao, China;2. The Hong Kong Polytechnic University, Hong Kong;1. National-Local Joint Engineering Laboratory of Geo-Spatial Information Technology, Hunan University of Science and Technology, Xiangtan 411201, PR China;2. Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, PR China;3. Institute of Space Sciences, Shandong University, Weihai 264209, PR China;4. State Key Laboratory of Geo-information Engineering, Xi’an 710054, PR China;5. Hunan Province Mapping and Science and Technology Investigation Institute, Changsha 410007, PR China;6. Department of Surveying Engineering, School of Transportation, Southeast University, Nanjing 210096, PR China;7. Key Laboratory of Virtual Geographic Environment, Minister of Education, Nanjing Normal University, Nanjing 210046, PR China;1. Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia;2. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia;3. Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia;4. Institute of Cosmophysical Researches and Radio Wave Propagation FEB RAS, Paratunka, Russia;5. Institute of Geophysics UB RAS, Ekaterinburg, Russia;6. Pushkov Institute of Terrestrial Magnetizm Ionosphere and Radio Wave Propagation RAS, Moscow, Russia;7. West Department of Pushkov Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation RAS, Kaliningrad, Russia;8. Leibniz Institute for Atmospheric Physics, Kühlungsborn, Germany |
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| Abstract: | The NeQuick electron density model of the ionosphere is designed for trans-ionospheric propagation applications. The model topside has been revised on the basis of ISIS 2 topside sounder profiles, producing a new formulation of its empirical shape parameter. Comparisons between experimental slant TEC data and values modelled using both versions of NeQuick topside showed that in general we have obtained a distinct improvement. However, during some months of the year and at low latitudes, the new topside formulation does not produce improvements on the slant TEC estimates. We discuss the likely reasons for this behaviour including assessment of merits and shortcomings of the ISIS 2 data in low latitudes. The topside sounder on Intercosmos 19 satellite extensively sounded the equatorial region during a period of high solar activity, which was less covered by ISIS 2. This paper presents comparisons of NeQuick and topside sounders profiles at low latitudes using Intercosmos 19 satellite data. |
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